diff options
author | 2019-06-25 08:42:25 -0500 | |
---|---|---|
committer | 2019-06-25 08:42:25 -0500 | |
commit | d7929c1e13e3788e7cb741d75b5baec5e53eff21 (patch) | |
tree | cf513071edfc4499b4e025e4846244c9d0e4c6bd /arch/x86/power/hibernate.c | |
parent | drm/amdgpu: disable gfxoff on navi10 (diff) | |
parent | drm/edid: use for_each_displayid_db where applicable (diff) | |
download | linux-dev-d7929c1e13e3788e7cb741d75b5baec5e53eff21.tar.xz linux-dev-d7929c1e13e3788e7cb741d75b5baec5e53eff21.zip |
Merge branch 'drm-next' into drm-next-5.3
Backmerge drm-next and fix up conflicts due to drmP.h removal.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'arch/x86/power/hibernate.c')
-rw-r--r-- | arch/x86/power/hibernate.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/arch/x86/power/hibernate.c b/arch/x86/power/hibernate.c index 4845b8c7be7f..fc413717a45f 100644 --- a/arch/x86/power/hibernate.c +++ b/arch/x86/power/hibernate.c @@ -11,6 +11,7 @@ #include <linux/suspend.h> #include <linux/scatterlist.h> #include <linux/kdebug.h> +#include <linux/cpu.h> #include <crypto/hash.h> @@ -245,3 +246,35 @@ out: __flush_tlb_all(); return 0; } + +int arch_resume_nosmt(void) +{ + int ret = 0; + /* + * We reached this while coming out of hibernation. This means + * that SMT siblings are sleeping in hlt, as mwait is not safe + * against control transition during resume (see comment in + * hibernate_resume_nonboot_cpu_disable()). + * + * If the resumed kernel has SMT disabled, we have to take all the + * SMT siblings out of hlt, and offline them again so that they + * end up in mwait proper. + * + * Called with hotplug disabled. + */ + cpu_hotplug_enable(); + if (cpu_smt_control == CPU_SMT_DISABLED || + cpu_smt_control == CPU_SMT_FORCE_DISABLED) { + enum cpuhp_smt_control old = cpu_smt_control; + + ret = cpuhp_smt_enable(); + if (ret) + goto out; + ret = cpuhp_smt_disable(old); + if (ret) + goto out; + } +out: + cpu_hotplug_disable(); + return ret; +} |